There was no breach of contract; HashFast either delivered the goods or issued (5% more than) full refunds to all Batch 1 customers.
You did not replace the broken BBJet I got. It's still underperforming even after a few firmware updates. The initial emails I got said "if this firmware does not fix it, I'll have a replacement board shipped to you on Monday". Lies. Breach of contract.
You did not ship out any of the MPP on the BBJets of Batch #1 you shipped. The MPP calculation started 1st of November, so you could have shipped it out the 1st of Feb. You did not. So yet another breach of contract
Do I need to bring up the still-to-ship upgrade kits? Batch #2 Sierras? The MPP on those Sierras?
How many breaches of contract are you looking at at this point? 5?
Plus the pertinent lies your marketing crew spewed up luring in punters, like "we'll do full BTC refunds"